North Korea has attempted to launch an unidentified missile, but the test failed, South Korea's Joint Chiefs of Staff have said.
Its goal is to create a long-range nuclear missile that can hit the United States.
The US Pacific Command said they detected a missile launch and that it "blew up almost immediately".
Earlier the country had said it was "ready for nuclear war".
Sunday's launch comes a day after the country celebrated the 105th birthday of late North Korea founder Kim Il Sung.